1 /* 2 * Copyright © 2014 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sub license, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the 13 * next paragraph) shall be included in all copies or substantial portions 14 * of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 22 * IN THE SOFTWARE. 23 */ 24 25 #include <linux/string_helpers.h> 26 27 #include <drm/drm_print.h> 28 29 #include "i915_params.h" 30 #include "i915_drv.h" 31 32 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, 33 "DRM_UT_CORE", 34 "DRM_UT_DRIVER", 35 "DRM_UT_KMS", 36 "DRM_UT_PRIME", 37 "DRM_UT_ATOMIC", 38 "DRM_UT_VBL", 39 "DRM_UT_STATE", 40 "DRM_UT_LEASE", 41 "DRM_UT_DP", 42 "DRM_UT_DRMRES"); 43 44 #define i915_param_named(name, T, perm, desc) \ 45 module_param_named(name, i915_modparams.name, T, perm); \ 46 MODULE_PARM_DESC(name, desc) 47 #define i915_param_named_unsafe(name, T, perm, desc) \ 48 module_param_named_unsafe(name, i915_modparams.name, T, perm); \ 49 MODULE_PARM_DESC(name, desc) 50 51 struct i915_params i915_modparams __read_mostly = { 52 #define MEMBER(T, member, value, ...) .member = (value), 53 I915_PARAMS_FOR_EACH(MEMBER) 54 #undef MEMBER 55 }; 56 57 /* 58 * Note: As a rule, keep module parameter sysfs permissions read-only 59 * 0400. Runtime changes are only supported through i915 debugfs. 60 * 61 * For any exceptions requiring write access and runtime changes through module 62 * parameter sysfs, prevent debugfs file creation by setting the parameter's 63 * debugfs mode to 0. 64 */ 65 66 i915_param_named(modeset, int, 0400, 67 "Use kernel modesetting [KMS] (0=disable, " 68 "1=on, -1=force vga console preference [default])"); 69 70 i915_param_named_unsafe(enable_dc, int, 0400, 71 "Enable power-saving display C-states. " 72 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " 73 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); 74 75 i915_param_named_unsafe(enable_fbc, int, 0400, 76 "Enable frame buffer compression for power savings " 77 "(default: -1 (use per-chip default))"); 78 79 i915_param_named_unsafe(lvds_channel_mode, int, 0400, 80 "Specify LVDS channel mode " 81 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); 82 83 i915_param_named_unsafe(panel_use_ssc, int, 0400, 84 "Use Spread Spectrum Clock with panels [LVDS/eDP] " 85 "(default: auto from VBT)"); 86 87 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, 88 "Override/Ignore selection of SDVO panel mode in the VBT " 89 "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); 90 91 i915_param_named_unsafe(reset, uint, 0400, 92 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])"); 93 94 i915_param_named_unsafe(vbt_firmware, charp, 0400, 95 "Load VBT from specified file under /lib/firmware"); 96 97 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 98 i915_param_named(error_capture, bool, 0400, 99 "Record the GPU state following a hang. " 100 "This information in /sys/class/drm/card<N>/error is vital for " 101 "triaging and debugging hangs."); 102 #endif 103 104 i915_param_named_unsafe(enable_hangcheck, bool, 0400, 105 "Periodically check GPU activity for detecting hangs. " 106 "WARNING: Disabling this can cause system wide hangs. " 107 "(default: true)"); 108 109 i915_param_named_unsafe(enable_psr, int, 0400, 110 "Enable PSR " 111 "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " 112 "Default: -1 (use per-chip default)"); 113 114 i915_param_named(psr_safest_params, bool, 0400, 115 "Replace PSR VBT parameters by the safest and not optimal ones. This " 116 "is helpful to detect if PSR issues are related to bad values set in " 117 " VBT. (0=use VBT parameters, 1=use safest parameters)"); 118 119 i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, 120 "Enable PSR2 selective fetch " 121 "(0=disabled, 1=enabled) " 122 "Default: 0"); 123 124 i915_param_named_unsafe(enable_sagv, bool, 0600, 125 "Enable system agent voltage/frequency scaling (SAGV) (default: true)"); 126 127 i915_param_named_unsafe(force_probe, charp, 0400, 128 "Force probe options for specified supported devices. " 129 "See CONFIG_DRM_I915_FORCE_PROBE for details."); 130 131 i915_param_named_unsafe(disable_power_well, int, 0400, 132 "Disable display power wells when possible " 133 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 134 135 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)"); 136 137 i915_param_named_unsafe(enable_dpt, bool, 0400, 138 "Enable display page table (DPT) (default: true)"); 139 140 i915_param_named_unsafe(load_detect_test, bool, 0400, 141 "Force-enable the VGA load detect code for testing (default:false). " 142 "For developers only."); 143 144 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400, 145 "Force a modeset during gpu reset for testing (default:false). " 146 "For developers only."); 147 148 i915_param_named_unsafe(invert_brightness, int, 0400, 149 "Invert backlight brightness " 150 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 151 "report PCI device ID, subsystem vendor and subsystem device ID " 152 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 153 "It will then be included in an upcoming module version."); 154 155 i915_param_named(disable_display, bool, 0400, 156 "Disable display (default: false)"); 157 158 i915_param_named(memtest, bool, 0400, 159 "Perform a read/write test of all device memory on module load (default: off)"); 160 161 i915_param_named(mmio_debug, int, 0400, 162 "Enable the MMIO debug code for the first N failures (default: off). " 163 "This may negatively affect performance."); 164 165 /* Special case writable file */ 166 i915_param_named(verbose_state_checks, bool, 0600, 167 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 168 169 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 170 "Force enable atomic functionality on platforms that don't have full support yet."); 171 172 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 173 i915_param_named_unsafe(edp_vswing, int, 0400, 174 "Ignore/Override vswing pre-emph table selection from VBT " 175 "(0=use value from vbt [default], 1=low power swing(200mV)," 176 "2=default swing(400mV))"); 177 178 i915_param_named_unsafe(enable_guc, int, 0400, 179 "Enable GuC load for GuC submission and/or HuC load. " 180 "Required functionality can be selected using bitmask values. " 181 "(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)"); 182 183 i915_param_named(guc_log_level, int, 0400, 184 "GuC firmware logging level. Requires GuC to be loaded. " 185 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 186 187 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 188 "GuC firmware path to use instead of the default one"); 189 190 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 191 "HuC firmware path to use instead of the default one"); 192 193 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 194 "DMC firmware path to use instead of the default one"); 195 196 i915_param_named_unsafe(gsc_firmware_path, charp, 0400, 197 "GSC firmware path to use instead of the default one"); 198 199 i915_param_named_unsafe(enable_dp_mst, bool, 0400, 200 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 201 202 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 203 i915_param_named_unsafe(inject_probe_failure, uint, 0400, 204 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 205 #endif 206 207 i915_param_named(enable_dpcd_backlight, int, 0400, 208 "Enable support for DPCD backlight control" 209 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)"); 210 211 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 212 i915_param_named(enable_gvt, bool, 0400, 213 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 214 #endif 215 216 #if CONFIG_DRM_I915_REQUEST_TIMEOUT 217 i915_param_named_unsafe(request_timeout_ms, uint, 0600, 218 "Default request/fence/batch buffer expiration timeout."); 219 #endif 220 221 i915_param_named_unsafe(lmem_size, uint, 0400, 222 "Set the lmem size(in MiB) for each region. (default: 0, all memory)"); 223 i915_param_named_unsafe(lmem_bar_size, uint, 0400, 224 "Set the lmem bar size(in MiB)."); 225 226 static void _param_print_bool(struct drm_printer *p, const char *name, 227 bool val) 228 { 229 drm_printf(p, "i915.%s=%s\n", name, str_yes_no(val)); 230 } 231 232 static void _param_print_int(struct drm_printer *p, const char *name, 233 int val) 234 { 235 drm_printf(p, "i915.%s=%d\n", name, val); 236 } 237 238 static void _param_print_uint(struct drm_printer *p, const char *name, 239 unsigned int val) 240 { 241 drm_printf(p, "i915.%s=%u\n", name, val); 242 } 243 244 static void _param_print_ulong(struct drm_printer *p, const char *name, 245 unsigned long val) 246 { 247 drm_printf(p, "i915.%s=%lu\n", name, val); 248 } 249 250 static void _param_print_charp(struct drm_printer *p, const char *name, 251 const char *val) 252 { 253 drm_printf(p, "i915.%s=%s\n", name, val); 254 } 255 256 #define _param_print(p, name, val) \ 257 _Generic(val, \ 258 bool: _param_print_bool, \ 259 int: _param_print_int, \ 260 unsigned int: _param_print_uint, \ 261 unsigned long: _param_print_ulong, \ 262 char *: _param_print_charp)(p, name, val) 263 264 /** 265 * i915_params_dump - dump i915 modparams 266 * @params: i915 modparams 267 * @p: the &drm_printer 268 * 269 * Pretty printer for i915 modparams. 270 */ 271 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 272 { 273 #define PRINT(T, x, ...) _param_print(p, #x, params->x); 274 I915_PARAMS_FOR_EACH(PRINT); 275 #undef PRINT 276 } 277 278 static void _param_dup_charp(char **valp) 279 { 280 *valp = kstrdup(*valp, GFP_ATOMIC); 281 } 282 283 static void _param_nop(void *valp) 284 { 285 } 286 287 #define _param_dup(valp) \ 288 _Generic(valp, \ 289 char **: _param_dup_charp, \ 290 default: _param_nop)(valp) 291 292 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 293 { 294 *dest = *src; 295 #define DUP(T, x, ...) _param_dup(&dest->x); 296 I915_PARAMS_FOR_EACH(DUP); 297 #undef DUP 298 } 299 300 static void _param_free_charp(char **valp) 301 { 302 kfree(*valp); 303 *valp = NULL; 304 } 305 306 #define _param_free(valp) \ 307 _Generic(valp, \ 308 char **: _param_free_charp, \ 309 default: _param_nop)(valp) 310 311 /* free the allocated members, *not* the passed in params itself */ 312 void i915_params_free(struct i915_params *params) 313 { 314 #define FREE(T, x, ...) _param_free(¶ms->x); 315 I915_PARAMS_FOR_EACH(FREE); 316 #undef FREE 317 } 318